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Library of Congress Subject Areas (15714)
- A General Works (61)
  - AC Collections. Series. Collected works (17)
  - AI Indexes (General) (22)
  - AM Museums (General). Collectors and collecting (General) (4)
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- B Philosophy. Psychology. Religion (25)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (5)
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- E History America (1)
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- G Geography. Anthropology. Recreation (40)
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- H Social Sciences (5425)
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    - HD1401 Agriculture-Economic aspects (100)
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- L Education (786)
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- M Music and Books on Music (10)
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- N Fine Arts (802)
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- P Language and Literature (425)
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- Q Science (1211)
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- R Medicine (19)
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- S Agriculture (1306)
  - S Agriculture (General) (1122)
    - S590-599.9 Soils. Soil science (148)
    - S631-667 Fertilizers and Improvement of the soil (128)
  - SB Plant culture (218)
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    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (110)
  - SD Forestry (24)
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  - SK Hunting sports (1)
- T Technology (4874)
  - T Technology (General) (1533)
    - T55.4-60.8 Industrial engineering. Management engineering (370)
    - T201 Patents. Trademarks (6)
    - T385 Computer Graphics (80)
    - T58.6-58.62 Management Information Systems (455)
  - TA Engineering (General). Civil engineering (General) (528)
  - TC Hydraulic engineering. Ocean engineering (9)
  - TD Environmental technology. Sanitary engineering (859)
  - TE Highway engineering. Roads and pavements (34)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (2)
  - TH Building construction (65)
  - TJ Mechanical engineering and machinery (42)
  - TK Electrical engineering. Electronics Nuclear engineering (96)
    - TK5105 Computer Network (41)
    - TK5105.882 Internet (35)
    - TK5105.888 World Wild Web (39)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1753)
    - TP155 Chemical engineering (1321)
    - TP368 Food processing and manufacture (300)
    - TP500 Fermentation industries. Beverages. Alcohol (15)
  - TR Photography (8)
  - TS Manufactures (228)
    - TS 155-194 Production Management, Operations Management (163)
    - TS 180-TS180.8 Material Handling (9)
  - TT Handicrafts Arts and crafts (9)
  - TX Home economics (15)
- U Military Science (8)
  - U Military Science (General) (8)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (46)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (27)
  - Z719 Libraries (General) (8)
  - ZA Information resources (14)
    - ZA4050 Electronic information resources (3)
    - ZA4450 Databases (6)